Added default support to DummyValueCreationSession for type Lazy<T>

Based off of the behavior that is defined for Task. Discussed in issue #358.
I really want to test that it's a Fake that has been automatically created by FakeItEasy. I'll see about changing it to receiving a Dummy value. For the Dummy to be returned, I simply need to create a class such as that in the GuidDefinition test and it will work automatically? I'll change it to that in the test.